C8 Flashcards
C8 Rate of Reactions
Average Rate of Reaction =
(Amount of REACTANT USED or amount of PRODUCT FORMED)
divided by
TIME TAKEN.
What 4 factors affect the Rate of Reaction?
Temperature.
Surface Area.
Concentration of Solution / Pressure of Gases.
Presence of a Catalyst.
Collision Theory is…
An explanation of chemical reactions that states that the Rate of Reaction is PROPORTIONAL to the NUMBER OF COLLISIONS between reactant molecules. The MORE OFTEN reactant molecules COLLIDE, the MORE OFTEN THEY REACT with one another, and the FASTER the Rate of Reaction.
Activation Energy is…
The minimum energy needed for a reaction to take place.
What 2 factors make a reaction more likely to occur?
Increasing the frequency of particle’s collisions.
Increasing the energy they contain when they collide.
What effect does a LARGER SURFACE AREA have on the Rate of Reaction?
It allows the PARTICLES to COLLIDE MORE FREQUENTLY.
This INCREASES the Rate of Reaction due to COLLISION THEORY.
Increasing the surface area of an object…
Increases the Rate of Reaction.
How does increasing the TEMPERATURE affect the rate of reaction?
It allows the PARTICLES to have MORE KINETIC ENERGY.
This makes the particles MOVE FASTER and COLLIDE MORE FREQUENTLY.
The particles are MORE LIKELY to collide with ACTIVATION ENERGY.
This INCREASES the amount of SUCCESSFUL COLLISIONS.
This is turn INCREASES the Rate of Reaction.
Increasing the TEMPERATURE of an object
Increases the Rate of Reaction.
How does Increasing the TEMPERATURE of an object increase it’s ENERGY?
The PARTICLES move FASTER meaning they have more ENERGY.
This results on a HIGHER PROPORTION of particles having GREATER ENERGY than the ACTIVATION ENERGY.
This affects the Rate of Reaction.
How does increasing the CONCENTRATION of a substance affect Rate of Reaction?
The NUMBER of Reactant PARTICLES INCREASES.
This increases the FREQUENCY of COLLISIONS.
This INCREASES the Rate of Reaction due to COLLISION THEORY.
Increasing the CONCENTRATION of a substance…
Increases the Rate of Reaction.
How does increasing the PRESSURE of a GAS affect the Rate of Reaction
The NUMBER of Reactant PARTICLES in a given space INCREASES.
This increases the FREQUENCY of COLLISIONS.
This INCREASES the Rate of Reaction due to COLLISION THEORY.
Increasing the PRESSURE of a GAS…
Increases the Rate of Reaction.
What is NOT AFFECTED by change in PRESSURE or CONCENTRATION?
Activation Energy is not affected by PRESSURE of CONCENTRATION.
The ONLY thing affected is the FREQUENCY of COLLISIONS.
